Telemetering system



March 5, 1940-. a. A. STONE ET AL 2,192,656

TELEMETERING SYSTEM Filed Nov. 5, 19 38 2 Sheets-Sheet 1 BY FLOYD .ZF' 1.55?

A ORNEY 1am Mar. smo 82,192,656 v UNITED STATES PATENT OFFICE aim v I Guy A. Stone and Floyd 1. Frlsby, Rochester, N. 1., esigners to Taylor Instrument Companics, Rochester, N. Y., a corporation of New Yo Application November 5, 1938, semi] No. 288,156

3 Claims. (01. 111-351) This invention relates to remote position intion, fixed on the transmitter case. The pedicating arrangements and particularly to teleriphery of the cam is engaged by a roller] metering systems. mounted on a travelling pivot il arranged for In former telemetering systems, complicated vertical movement in a vertical guideway ii.

mechanisms including clutches, have been uti- The pivot Iii also supports a rotatable saddle 5 lized. Such mechanisms are expensive to manuin which there is mounted a well-known merfacture and are a frequent source of failure in cury bottle-type of switch II. This switch is service." normally tilted to its open position, as shown The present invention has for its mainpurin Fig. l, by a counterweight l8. However, an

pose a simplified telemetering system which emarm i4 attached to the saddle and projecting l0 ploys no clutches, whichisless expensivetomanuin a direction away from the counterweightis facture than former systems and which is more provided at its .free end with a pin l8 extending reliable in service. at right angles thereto forclosing-the switch.

A further purpose of the invention is the pro- This pin is positioned in the path of an angular l5 vision of a telemetering system in which two arm i8 which is carried by the free end of a ll correcting impulses are possible in each cycle of Bourdon spring H, or other condition responoperation, as distinguished from present systems sive means. This Bourdon spring as is well wherein but a single corrective impulse is posknown comprises part of a fluid-filled tube syssible in each cycle. v o tern including a capillary tube l8 connected at The various features and advantages of the one end to the Bourdon spring and at its other 20 invention will appear from the detailed descripend to a bulb is. tion and claims when taken with the drawings At the receiving station there is provided an i in which Fig. 1 is a plan view of the transmitindicating recorder as illustrated in Figs. 3 to 6 ter employed in the system of the present ininclusive. This recorder comprises a'clock mo 28 vention; Fig. 2 is also a plan view of this transtor which drives a shaft 26 to rotate a chart 25 1 mitter with the operating parts thereof shown support 21 in the well-known manner. .A chart rotated at 180 from the position shown in Fig. 28 is carried on the support in a position to be 1; Fig. 3 is a plan view of combined receiver engaged by the stylus ,28 which is carried on and recorder for use in the system, the parts the pen arm 80. This pen arm is adiustably 80 thereof being illustrated in the positions which carried by the well-known pen-arm bracket 8| 30 they occupy when the parts of the transmitter which is pivoted on a suitable arbor 32. The are in the position shown in Fig. 2; Fig. 4 is a pen-arm bracket Si is provided at the rear of side elevation of the receiver of Fig. 3 with the the chart support with an arm 38 in spaced reside wall of its casing omitted; Fig. 5 is an enlation to' the pen arm 30. W 38 larged detail view of the pen arm actuating The actuating mechanism for the pen arm 85 mechanism in the position illustrated in Fig. 3 comprises a -synchronous motor 84 operating in and Fig. 6 is anenlarged detail view of this synshronism with the motor 5 at the transmitmechanism in the position shown in Fig.4; Fig. '1 ting station. The motor 34 likewise drives a is a diagrammatic circuit arrangement of the heart-shaped cam in the direction indicated by 40 electrical system in which the previously menthe arrow in Fig. 3. The periphery of this 4. tioned transmitter and receiver are incorporatcam is engaged by a roller 38 carried at one ed: and Fig. 8 is a circuit diagram of a similar end of a bell crank lever 81 which is pivoted system in which three transmitters are incorto rock about the arbor 32 from its full line porated to actuate a single recorder of the mulposition. to its dotted line position, both illus- 5 tiple recording type. The present system comtrated in Fig. 3. It will be noted that the bell 5 prises a transmitter unit T and a receiving unit crank lever 31 in its upper or dotted line posi- I R, remotely located with respect to the trans- *tion. depresses the button 85 of a normally open mitter unit but connected thereto by electrical switch similar to switch 8 (Fig. l). The other conductors generally designated C. end of the bell crank lever 31 is provided with 5 The transmitter includes 'a synchronous moan angular arm 38 projecting toward the chart o tor Ii which drives a heart-shaped cam 8 in support. This arm has secured thereon a solethe direction indicated by the arrow of Fig. l. noid 39 provided with a core I. An armature The high point of the cam 8','as shown in Fig. 1, ll located in position tobe attracted to the is adapted to depress a button i to open 0. norsolenoid core, is pivoted at 42 on a lug carmaiiy closed switch 8 of any well-known construcried by the arm 88. The free end of the armaof the arm 33.

ture is normally urged away from the projecting end of the core by the spring 43, until the armature extension 44 engages a set screw or stop 45 adjustably mounted near the free end The armature has two stop bars 41 and 43 pivotally mounted thereon at 43 for limited rotation in one direction only at right angles to the long axes of the core 49. The bar 41 is provided with a flat face 41a to engage the end portion 33 of the pen arm bracket when the armature is attracted, while the bar 43 has a face 43a adapted to engage this end portion 33 when the armature is released. Stops 41b and 48b on the bars 41 and 43 norm'ally engage the fixed lug 50 being urged to this position by their respective springs 41c and 430. It should be understood that the friction of the pen arm bracket with the respect to the bearing for arbor 3;! is such that this bracket will not be dis placed when its arm 33 is engaged by the curved faces 41d and 43d of the stop bars 41 and 43 but instead, these bars will snap past the arm 33.

In considering the operation of the invention, it will first be assumed that the transmitting unit and the receiver unit just described are incorporated ln a simple remote control or remote transmission system. During the operation of the system, the motor 5 at the transmitting unit and the motor 34 at the receiving unit are continuously rotated. The circuit for the motor 5 normally extends from the alternating current source, conductor 56 through the field winding of the motor, normally closed switch 3, conductor 51 to the other side of the alternating current source. The field winding of the receiver motor 34 is connected across the source of current located thereat. transmitter, is utilized in synchronizing the motor 5 and 34 in a manner to be described. As

themotor 5 rotates, it rotates the heart-shaped cam 3 so that the follower or roller 9 with its mercury switch I2, is alternately elevated and.

lowered during each rotation of the cam.

Let it be assumed that the temperature at the bulb l9 increases, in which case the fluid medium in the tube system expands thereby causing the Bourdon spring I1 to unwind. This elevates the left-end of the bell crank lever IS in the path of the projecting portion l5 of the arm 14 on the vertically moving mercury switch I! to rock this switch to its closed position.

Since the motor 34 at the receiving unit is also continuously rotated, the heart-shaped cam 35 thereat, causes the bell crank lever 31 to oscillate during each cycle from its full line position to its dotted line position as illustrated in Fig. 3.

As soon as the mercury switch I! is closed at the transmitting station, it closes and energizes the circuit for the solenoid 33 at the receiving station. The circuit of this solenoid includes the secondary winding of the transformer 45, winding of the solenoid 39 and thence over conductor C, contacts of the mercury switch I! now closed, conductor C to the other terminal of' the secondary winding of the transformer. As soon as the solenoid 39 is energized, it attracts its armature to move the stop bar 41, carried thereby, into the path of the arm 33 which is carried by the pen arm bracket. If the solenoid 39 is deenergized at the time when the flat face 48a of the stop bar 48 is moving toward the arm 33, the pen arm bracket will be moved along with bell crank lever 31 in a clockwise direction until the solenoid is energized. However, if the solenoid is deenergized when the curved face 43d of The mentioned switch 3 at the' close at the instant that switch 3 opens.

the stop bar 4: is approaching the arm a, the

engagement of this arm with the stop bar will not move the pen arm bracket but instead, this stop bar will snap past the arm 33. By this arrangement, the pen arm bracket and the pen arm 30 are moved on an increase in temperature in a clockwise direction by the stop bar 43 until the pen arm. reaches a position which correctly indicates the temperature at bulb ID.

If, however, the temperature at the bulb II decreases, the Bourdon spring l1 will wind up and the free arm of the bell crank lever l3 will be lowered so that the interval during which the mercury switch I2 is closed in each cycle, is lengthened. Thus the solenoid 39 of the receiving unit will be energized for a longer portion of the cycle. In this way the solenoid armature will be in its attracted position for a longer interval so that the flat face of the stop bar 41, carried thereby, will engage the arm 33 of the pen arm bracket to move this bracket and its pen arm in a counterclockwise direction. It will be understood that when the position of the pen, arm 33 is such as to accurately indicate the temperature prevailing at the bulb l3, the solenoid will be respectively energized and deenergized during each cycle so that the flat faces 41:: and 43a of the stop bars will move out of the path of the arm '33. just at the time when the edges of this arm engage their respective flat faces.

It has been mentioned that it is desirable to bring the motor 5 at the transmitter and the motor 34 at the receiver into synchronism at least once during each cycle. This is effected by the operation of the normally closed switch 3 at the transmitting unit and by the normally open switch 55 at the receiving unit. The circuit of the receiver motor 34 is not interrupted while the system is in service so that the motor 34 operates continuously. On the other hand, the main operating circuit for the transmitter motor 5 is momentarily interrupted once during each cycle at the switch 3. However, if the motors 5 and 34 are in synchronism, switch 55 will Under these conditions the motor 5 will continue to operate by reason of a substitute circuit traceable from one side of the alternating current source, conductor 53, field winding of .the motor 5, conductor C, switch 55 (now closed), conductors C and 51 in series, tothe other side of the current source. If these motors are out of synchronism, the motor 5 will stop when switch 3 opens and will not start until switch 55 closes the mentioned substitute circuit. Thus motor 5 will be startedwhen .it is in synchronism with motor 34.

In Fig. 3 there is illustrated a modified circuit arrangement in which three transmitting units Tl, T2 and T3 selectively control a remotely located receiver RI. These transmitters may be identical with that shown in Fig. 1 and Fig. 2.

The receiverRl, with the exception of the common driving motor 34', may include three units like that shown in Figs. 3 and 4. In this receiver the switches 55a, 55b and 550 are opened simultaneously to maintain the motors 5a, 5b and 50 at the several transmitters in synchronism with the motor 34 at the receiver.

While the system has been described with particular reference to the remote recording of a thermal condition, the invention is not to be construed as limited by the description and drawings given by way of example only since it will be obvious that the, present system is adapted to many other uses such as the controlling and/or recording of. temperature, pressure, flow, etc.

We claim:

1. In a receiver for a telemetering system, a

pivotally mounted element, a constantly operating motor, a member continuously oscillated under the control of said motor in a path parallel to the path of movement of said element, a solenoid carried by said member, said solenoid having an armature movable from an attracted position to a normal position, and means controlled by said armature in its respective positions for setting said element.

2. In a receiver for a telemetering system, a pivotallymounted pen arm bracket, a constantly operating motor, a member continuously oscillated under the control of said motor in a path parallel to the path of movement or said bracket, a solenoid carried by said member, said solenoid having an armature movable from an attracted position to a normal position, a pair or bars on said armature, one bar being p itioned in the path or the pen arm bracket in the normal position of said armature and being effective to a move said bracket in one direction only, the other bar being positioned in the path of said bracket in the attracted position of said armature and being effective to move said bracket in the other direction only.

3. In a receiver for a telemetering system, an adjustable element, a motor, a member oscillated under the control of said motor, a solenoid carried by said member, said solenoid having an armature movable from an attracted position to a normal position, and means controlled by said armature in its respective positions for adjusting said element.

GUY A. STONE. FLOYD J. FRISBY. 

